Choline:
Choline is a water-soluble vitamin. Some animals are unable to produce choline, but must consume it through their diet to remain healthy. Humans, however, make choline in the liver. Choline contributes to normal homocysteine metabolism, normal lipid metabolism and to the maintenance of normal liver function.

Biotin:
Biotin is a water-soluble B-vitamin, also called vitamin B7 and formerly known as vitamin H or coenzyme R. It contributes to normal energy-yielding metabolism, normal functioning of the nervous system, normal macronutrient metabolism, normal psychological function, normal hair and skin and the maintenance of normal mucous membranes.